Validating a result
Sanity checks, row-count reconciliation, spot-checking against a known answer, and the habit of asking "what would this look like if it were wrong?" before shipping a number.
We mark it against a checklist you can read first
What counts as knowing this
Check a query result for correctness before trusting it, and say what you checked
A check for this one skill
Up to 2 questions on this skill alone, marked against the bar beside this. It stops as soon as the answer is clear. No account, and your answers are not kept.
You'll need these first
Helpful, but not required
Start on SQL & Data Analysis
Every skill above, ordered by what depends on what, with the projects above that as the evidence you actually did it. We work out where you already are first, so the path skips what you can do.
Start this path